With its own stock exchange, banking system and navy in place by the end of the 16th century, Hamburg has long been an important city. The efficient, straightforward and integrated HVV transit system offers a route planner in English. Having sprung up around a 9th-century castle, Hamburg has some unique sites, including the landmark St Michael's Church and museums showcasing art to erotica. For a look into the wild heart of this port, visit the Reeperbahn, Hamburg's notorious nightlife centre.